DEFINITION:Chemical or mechanical treatment designed

to increase the stability of a soil mass and improve its engineering properties.

Modification of soil structure and the reduction of the moisture content of cohesive soils lead to a considerable improvement in bearing capacity. Modification of soil structure is the concept of soil stabilization.

strength improvementDust controlSoil waterproofing

Slope Failures Bridge FailuresStructural failuresThese above failures can be eliminated by

stabilizing the soil.

Shear strengthDensityPermeability.Surface Area. Atmospheric Conditions.

CompactionAltering size distribution Drying

Compaction has following effects on the soil:Increases densityIncreases strengthReduces permeability

Performance of soil can be greatly improved by drying in sun or oven

Combination of chemical & physical reactions.

Materials known as stabilisers:LimeCementBitumen

Flocculation - fine particles stick together -size

distribution changes

Lime + silica + alumina

Physical reaction

cementgels

chemical reaction

Lime + clay

LIME STABILIZATION –factors affecting

• Pulverization and scarification• Lime content• Uniformity of mixing• Compaction• Curing• Additives

Construction of soil lime base course• Preparation of subgrade• Pulverization of soil to be stabilised• Addition of lime with water and mixing• Allow the mix to age for one day and remix when

pulverization becomes easy• Adding rest of lime,water if necessry and remixing• Spreading to desired grade and compacting• Soil lime protected from drying out and allowed

moist curing• Field tests-OMC at compaction and Dry density after

the compaction.

Low volume road construction -base coarse & wearing coarse.

Sub grade improvement for low & high volume roads.

CEMENT STABILIZATION -factors

• Soil• Cement content• Uniformity of mixing• Compaction• Curing.• Additives

Construction of Soil Cement stabilization

• Preparation of subgrade• Pulverisation of soil• Application of cement and dry mixing• Addition or spraying water and remixing• Spreading and grading• Compaction• Curing the soil cement layer• Field tests

METHOD OF APPLICATION AT SITE

• Cement stabilised soils usually stronger than lime stabilised soils.• Similar uses to lime stabilised soils.

Improves the strength and durabilityStabilisation of sub-grade to increase CBRReductions in bulk dig quantities This technique is a cost effective alternative to

importing aggregates for both temporary and permanent works.

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